PPC PMAC driver
Buffersize is a bit small compared to the OSS driver (dmasound.h says
128kb is limit for Amiga, for pmac 256kb is used)
At least on Snapper, some samplerates cause choppy sound when
periods<3 or buffersize is not a multiple of periodsize.
Signed-off-by: Danny Tholen <obiwan@mailmij.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>